Mr. Hurtzig. would not be considered excessive by engineers. The gates were expensive ; green-heart was dear, and the members would not be surprised to hear that the price of the gates was higher than usual for iron, pitch-pine, or other material. The cost pcr foot super of the lock-gates, which were 40 feet high and 50 feet wide, was 48s. The price of gates varied from 25s. to 45s. at various sites. The cost of the two graving-docks, including the pumpingstation and pumps, which, however, were designed to perform in addition another duty, was ;E130,800. The cost of the lockentrance, excluding gates, was &138,200, but this amount included all the cost of the "blow." Correspondence.

Reports, with the view of testing, by the results of experience, the soundness of the views then expressed on both sides of the question. This, then, is the object of the present Paper. At the outset, a few remarks upon the history and growth of the Indian Railway system, which is now approaching in magnitude that of the United Kingdom, and which bids soon to surpass it, may not be out of place. Commencing on the 18th of April, 1853, with the opening of the first section of the Great Indian Peninsula Railway, between Bombay and ThQna, a distance of 20% miles, the system has expanded until, on the 31st of March, 1887, the total length opened for public traffic was 13,3902 miles, while an additional length of 3,2052 miles was in progress or had been sanctioned for construction. Taking quinquennial periods, the following Table shows the growth of the system :-Pear. Miles Open for Tra5c.

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